Fluid operated mechanism



Dec. 31, 1940. R. Bisel-OFF FLUID OPERATED MECHANSM 2 SheetsSheet 1Filed Aug. 19, 1937 ON` m" m, uw. mm.

mm uw@ mm :inventor ROBERT slscHoFF (Ittorneg Dec. 31, 194%l Raiser-:OFF

* FLUID OPERATED MEQHANISU 2 Sheets-Sheet 2 Filed Aug. 19, 1937 Fig 3:inventor @ERT Bisel-IOFF Cittorneg Patented Dec. 31., 1940 UNITEDSTATES Artnr orifice Pennsylvania Application August 19, 1937, serialNeisatzs 1 Claim.

This invention relatesY to valve devices, and more particularly to iiuidoperated mechanism for controlling the operation of the valves.

An objectof the invention is to? provide an improved iiuid operatedmechanism and control valve device operated thereby.

Another object of the invention is lto provide an improved pilot valvedevice and diaphragm mechanism therefor.

Another object ofthe invention is to provide an improved diaphragmoperated valve mechamsm which is compact and vpositive in its operation.

With the foregoingV and other objects and advantages in vievv', theinvention consists in the construction and arrangement of the severalparts which will be hereinafter more fully described and claimed. l

In the accompanying drawings:

Fig. 1 is an elevation, partly in section, of the diaphragm andassociated parts;

Fig. 2 is a section of the valve device operated by the diaphragm shownin Fig. 1; andl Fig. 3 is a vertical transverse section taken on theline 3-3 of Fig. 1. Y v

Referring tothe drawings, the invention ernbodies a suitable controlvalve device 9| formed with a chamber' 96 which is adapted to Abeconnected to a suitable source of huid supplyby a pipe 97. v

On one side of the chamber 95v there is a cham-k ber 92, and on the'other side of thechamber 96 there is a chamber 94.

Chambers 92 and 94 'are respectively connected to chamber 99 by ports 98and 99;

One end of a pipe 93 can be connected to chamber 92, and one end of apipe 95fcan be connected to chamber 94.

The control valve device' 9| is also formed with chambers |00 and |0'|which are connected'by a' passage |92, and said passageisl connected toa sewer or other free discharge by a pipe |03'.

Chamber 92 is connected to the chamber |00 by a port |04 and chamber 94is connected to the chamber |0| by a port |05.

Communication through ports 99 and |04 is controlled by a valve head|06, and communication through ports 99 and |05 is controlled by a valvehead |01.

The valve heads |06 and |91 are mounted on a rod |03 adapted to bereciprocated in such a manner as to shift said valve heads toalternately close and open the ports. Thus, when the valve heads are inone extreme position, communication through ports 99 and |04 will be cutolf, and

ports 98 `and 505 Will be open, and When the valve heads are in theirother extreme position, communication through the ports 98 and |05 willbe cut `ofr` ,'and ports 99 and |94 will be open. In the presentinstance, the valve operating 5 rou me is shtwnoperauvely cdnnecteu to ahuid `'ress ure' operated device, such as a diaphragm device lll. Thediaphragm device l has a diaphragm ||2 mfufitd ina sumaba casing betweentwo` cham-v 10 bers H3 and lili. Both of said chambers ||3 and lkareadapted to be connected to operating fluid under. VLuessure in a Wellknown manner (not shovvn). A

,The movement of the diaphragm ||2 is limited l5 by stops ll'l and H8formed in the casing of the diaphragm device on opposite sides of saiddiathrash. p

Fii'ed to the diaphragm H2, is a rod or stem l i9,- the ends Aofi whichrod are slidably mounted 20 in bushings |20 and |2|` carried in thelcasing on opposite sides respectively of the diaphragm. The `ends ofthe rod ||9 do not extend through the diaphragm casing, and the`openings in the casing, in which the bushings |20 and |2| are 25mountedaare closed by threaded plugs |22 and |23, respectively, s o thatthe diaphragm chambers I3 and 4 'will be fluid-tight.

Mounted on the rod |I9 is a collar |24 having an annular groove 25formed therein for the re- 30 cep'tion,v of ,a pair of diametricallydisposed pi'ns |25V carried by the upper spaced arms of a yoke l`2.

The yoke |27 is keyed to a rock shaft |28' mounted transversely inthediaphragm casing 35 with respect to the rod ||9said shaft being disposedbeneath said4 rod (see Fig. 3).

, One end of thel rock shaft |28 projects outwardly through a Wall ofthecasing of the diaphragm device i |,V saidl shaft being rotatably mountedin 40 spaced bushings |29, |30 and |3|. Leakage' of fluidaround theshaft' |28 is prevented by a packing nut |32.'

Mounted on the portion of the rock shaft |29 45 which is disposedexteriorly of the casing of the diaphragm device is a lever |33.

The upper end `of the lever |33 is forked, as shown in Fig. 3, and thisforked portion of the lever carries diametrically disposed pins |34 50which operatively engage a sleeve |35 mounted on the rod |08 of thecontrol valve device 9|.

The sleeve |35 is mounted on the rod |08 in such a manner thatreciprocating movements imparted to the rod 09 and the valves |06 and|01 55 by the mechanism of the diaphragm device III, will be cushioned.

For the purpose of resiliently mounting the sleeve |35 on the rod |08,the outer portion of the A rod is somewhat reduced in diameter, as shownin Fig. 2, and mounted on the outer end of the reduced portion is asmaller cylindrical sleeve |4| secured in place by a pin |50. On sai-dreduced portion are slidably iitted two washers |31 and |39, of largeroutside diameter than the diameter of the rod |08 `and the sleeve |4with their inner margins abutting respectively the shoulder |38 formedby the reduced portion of the rod and the end of the sleeve |4I, andheld in place between said washers is a helical spring |36. lThe sleeve|35 has a portion at one end slidably fitting the rod |08 and theremainder of its length is counterbored to slidably receive the spring|36 and the washers |31, |39, and is retained in longitudinal positionthereon b-y a short screw threaded sleeve |40 engaging internal threadsin the other end of the sleeve |35, and locked in adjusted position byaset screw |42, the sleeve |40 slidably fitting on the sleeve |4|.

The outer marginal portions of the washers |31 and` |30 abut,respectively, the inner end of' the counterbore of the sleeve |35 andthe inner end of the sleeve |40, the distance between which is, byadjustment of the screw sleeve |40, made the same as the distancebetween the shoulderI |38 and the sleeve |4| on the rod |08. It followsfrom the arrangement of parts just -described that movement of thesleeve |35 longitudinally in either direction will be communicated tothe valve rod |08 only by force transmitted through the spring |36, thesleeve |35 itself being otherwise freely slidable on the rod, and afterthe valve rod has been moved in one direction far enough to eifectclosing of the valve heads |06 and |01 against their seats in onedirection, any further movement of the sleeve |35 will be cushioned bycompression of the spring |36, and the same action will take place uponmovement of the sleeve |35 inthe opposite direction.

I The lever |33 extends downwardly from the rock shaft |28 a suitabledistance and has connected thereto, as at |43one end of a rod |44.

Encircling rod |44 is an expansible coil spring |45, one end of whichbears against a Washer |46 which abuts a wall |41 of a bracketsupporting the valve device 9| and the diaphragm device I. The other endof thespring bears against a washer |48, adjustably positioned on theouter portion of the rod |44, by means of nuts v|49 threaded on to saidrod. The'spring |45 is operatively associated withA the diaphragm ||2 in'the manner to be hereinafter described.

When the fluid pressure in the diaphragm chamber ||3 exceeds thecombined pressure of fluid in the diaphragm chamber H4, plus thepressure of spring |45, the diaphragm ||2 is moved towards the left, asviewed in Fig. 1, and this diaphragm movement is transmitted to thecontrol valve device 9|, and the latter is operated so that fluid isvented to the sewer or other free discharge from chamber 92, throughpipe |03, and iiuid under pressure is supplied to chamber 94, from thesource of supply pipe 91 and chamber 96.

When the uid pressure in diaphragm chamber I4 is increased so that theiiuid pressure on both sides of the diaphragm ||2 becomes substantiallyequal, the force of the spring |45 on one side of the diaphragm ||2 willmove the diaphragm against the seat ||1 and thus the valve heads |06 and|01 of the control valve device 9| will be returned to the positionshown in Fig. 2.

One of the salient features of the present invention is in theconstruction of the diaphragm device and its associated parts. In theusual form of diaphragm device, in which the operating rod which isconnected to the diaphragm projects outwardly through the diaphragmcasing, considerable diiculty has been experienced in preventing leakageof fluid around the rod from the diaphragm chamber. The packing glandusually used at the point `where the rod passes through the diaphragmcasing must be kept tight, and

consequently when the packing gland is tight, the friction is so greatas to greatly retard the free movement of the rod and the diaphragmconnected thereto. v

Accordingly, instead of transmitting the movements of the diaphragm tothe control valve device 9| by a reciprocating rod projecting outwardlythrough the casing of the diaphragm device in the instant case, themovements of the diaphragm ||2 are transmitted out of the diaphragmcasing by means of the rock shaft |28 which turns through a small angleand consequently requires a type of packing gland where such shaftprojects through the casing of the diaphragm device which does nothinder the free movements of the several parts of the diaphragm device.Thus, the controlling mechanism for the valve will be more sensitivethan would be the case Vwere the control valve device 9| directlyconnected to the operating rod of the diaphragm.

Having thus described my invention, what I claim is: Y

A resilient operating connection for a reciprocating rod comprising -aportion of reduced diameter on apfree end of said rod forming ashoulder, an outer sleeve having one end slidable on the main part ofthe rod and having a counterbore forming an internal shoulder, slidablyintertted inner sleeves secured respectively on the end of the reducedportion of the rod and within the end of said counterbore, one of saidlatter sleeves being adjustable to space the said inner sleeves at equaldistance from the shoulders on said rod and outer sleeve respectively, acompression spring on said reduced portion of the rod between saidshoulders and inner sleeves, means for transmitting the pressure ofeither end of said spring to either the rod or the outer sleeve, andmeans for reciprocating the outer sleeve.

ROBERT BIISCHOFF.

